<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* p{
            color:red;
            font-size: 30px;
        }
        span{
            color: aquamarine;
        } */


        /* .red {
            color: red;
        }

        .green {
            color: green;
        }

        .blue {
            color: blue;
        }

        #aaa {
            color: blueviolet;
        } */
         p.red{
            color: red;
         }
    </style>
    <!-- <link rel="stylesheet" href="css.css"> -->
</head>

<body>

    <p class="red">hello1</p>
    <p class="green">hello2</p>
    <p class="blue">hello3</p>
    <span class="red">你好</span>
    <div class="green">你好</div>
    <div>
        <ul>
            <li id="aaa">111</li>
            <li>222</li>
            <li>333</li>
        </ul>
        <ol>
            <li>111</li>
            <li>222</li>
            <li>333</li>
        </ol>
    </div>
</body>

</html>